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Re: [Xen-devel] Question about "16-byte MMIO emulation fix"


From: Fabio Fantoni [mailto:fabio.fantoni@xxxxxxx] 
Sent: 12 May 2015 15:35
To: xen-devel
Cc: Yu, Zhang; Paul Durrant
Subject: Question about "16-byte MMIO emulation fix"

Hi I saw:

This is Zhang Yu from Intel graphic virtualization team. Previously in Xen
hackathon, Paul and I mentioned that there're several patch series for XenGT
that need to be tracked on Xen 4.6.
  Here, I'd like to confirm with you about these patchsets:
  1> 16-byte MMIO emulation fix â owned by Paul;
in xen 4.6 post, this thing should solves also qxl problem on linux domU 
(excluding on SLES):
qemu crash with: 

#0Â __memset_sse2 () at ../sysdeps/x86_64/multiarch/../memset.S:908 
Latest istruction: 
=> 0x7ffff3713f7b <__memset_sse2+2363>:ÂÂÂ movntdq %xmm0,(%rdi) 

Is there any experimental patch available for testing or nothing for now?

Thanks for any reply and sorry for my bad english.

The code is very tricky to fix. It has layers of band-aids dating back many 
years. I'm getting into it but it's likely to be a couple of weeks or so before 
I have something stable enough to post to the list.

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